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| <section id="module-apache_beam.runners.interactive.caching.write_cache"> |
| <span id="apache-beam-runners-interactive-caching-write-cache-module"></span><h1>apache_beam.runners.interactive.caching.write_cache module<a class="headerlink" href="#module-apache_beam.runners.interactive.caching.write_cache" title="Link to this heading"></a></h1> |
| <p>Module to write cache for PCollections being computed.</p> |
| <p>For internal use only; no backward-compatibility guarantees.</p> |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="apache_beam.runners.interactive.caching.write_cache.WriteCache"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">apache_beam.runners.interactive.caching.write_cache.</span></span><span class="sig-name descname"><span class="pre">WriteCache</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pipeline</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Pipeline</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">context</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext" title="apache_beam.runners.pipeline_context.PipelineContext"><span class="pre">PipelineContext</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">cache_manager</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.interactive.cache_manager.html#apache_beam.runners.interactive.cache_manager.CacheManager" title="apache_beam.runners.interactive.cache_manager.CacheManager"><span class="pre">CacheManager</span></a></span></em>, <em class="sig-param"><span class="n"><span class="pre">cacheable</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="apache_beam.runners.interactive.caching.cacheable.html#apache_beam.runners.interactive.caching.cacheable.Cacheable" title="apache_beam.runners.interactive.caching.cacheable.Cacheable"><span class="pre">Cacheable</span></a></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/write_cache.html#WriteCache"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.write_cache.WriteCache" title="Link to this definition"></a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.13)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Class that facilitates writing cache for PCollections being computed.</p> |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="apache_beam.runners.interactive.caching.write_cache.WriteCache.write_cache"> |
| <span class="sig-name descname"><span class="pre">write_cache</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.13)"><span class="pre">None</span></a></span></span><a class="reference internal" href="_modules/apache_beam/runners/interactive/caching/write_cache.html#WriteCache.write_cache"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.runners.interactive.caching.write_cache.WriteCache.write_cache" title="Link to this definition"></a></dt> |
| <dd><p>Writes cache for the cacheable PCollection that is being computed.</p> |
| <p>First, it creates a temporary pipeline instance on top of the existing |
| component_id_map from self._pipeline’s context so that both pipelines |
| share the context and have no conflict component ids. |
| Second, it creates a _PCollectionPlaceHolder in the temporary pipeline that |
| mimics the attributes of the cacheable PCollection to be written into cache. |
| It also marks all components in the current temporary pipeline as |
| ignorable when later copying components to self._pipeline. |
| Third, it instantiates a _WriteCacheTransform that uses the |
| _PCollectionPlaceHolder as the input. This adds a subgraph under top level |
| transforms that writes the _PCollectionPlaceHolder into cache. |
| Fourth, it copies components of the subgraph from the temporary pipeline to |
| self._pipeline, skipping components that are ignored in the temporary |
| pipeline and components that are not in the temporary pipeline but presents |
| in the component_id_map of self._pipeline. |
| Last, it replaces inputs of all transforms that consume the |
| _PCollectionPlaceHolder with the cacheable PCollection to be written to |
| cache.</p> |
| </dd></dl> |
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| </dd></dl> |
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